Test and simulation study on time series characteristic of rock acoustic emission in metallic mines

According to the specific geology conditions,the acoustic emission test was carried out on the rock to determine the time series characteristic of adjoining rock in mine.The critical acoustic emission parameters of rock breakage were analyzed and the breakage principle and characteristic of the acoustic emission signals were studied.Comparing tests were individually carried out on homogeneous specimens and specimens with cracks.Under the influence of crack,the regularity of acoustic emission signal of the specimens was generalized.Finally,the process of damage,failure and AE of rocks were simulated by Particle Flow Code which is based on the theory of Distinct Element Method according to variable strength and homogeneity.The inner impair of rock was simulated through reducing the rigidity of contact surfaces and the breakage of rock was studied by different simulation conditions.The conclusions will open a new way to study the acoustic emission regulation of impaired rock.